METHOD OF PROCESSING POTASSIUM-CONTAINING ORES Russian patent published in 2011 - IPC C01D3/08 

FIELD: process engineering.

SUBSTANCE: invention relates to chemistry and may be used in production of potassium chloride from sylvinite potash ores. Crushed potassium-containing ore is leached by flow of hot unsaturated leach to separate halite wastes from saturated solution of leach by filtration. Saturated solution of leach contains salt and clay sludges and is directed to two-stage clarification at settlers. Pulp of salt sludge is separated at the first stage and sent back in dissolution apparatuses. Clay sludge containing salt sludge is separated at the second stage. Clay-salt sludge is subjected to counter-flow rinsing. Clarified solution of saturated leach is cooled by vacuum crystallisation to extract potassium chloride.

EFFECT: higher yield of potassium chloride.

1 tbl, 5 ex